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Pros

Pro

Free unlimited projects & team members

Lean Testing is free for an unlimited number of team members or projects.

Pro

Hosted

Offers a hosted version, which is very helpful if you want to avoid the time and energy it takes to host a bug tracker on your own internal server.

Pro

Test plan manager

Includes a manager for testing plans.

Pro

Slack integration

Can easily be integrated with Slack.

Cons

Con

Not very popular

Since it's not a very popular solution, there are not as many guides and resources for this out there. Plus, there's also a greater risk of it shutting down one day than other, more popular issue trackers.